Question

(X-y=2
(2x-3y=-1

{X=y+2
{2(y+2)-3y=-1

Answer 1

1. (x-y=2 |-2
(2x- 3y=-1 |1

(-2x +2y=-4
(2x -3y = -1

(2y=-4
(-3y=-1

(y=-2
(y=-3

Answer 2

{X=y+2
{2(y+2)-3y=-1
2y+4-3y=-1
-y=-5
y=5